Fix deprecation warnings

src/drf_yasg/management/commands/generate_swagger.py

@@ -158,6 +158,7 @@ class Command(BaseCommand):
         else:
             # normally this would be easily done with open(mode='x'/'w'),
             # but python 2 is a pain in the ass as usual
+            # TODO: simplify when dropping support for python 2.7
             flags = os.O_CREAT | os.O_WRONLY
             flags = flags | (os.O_TRUNC if overwrite else os.O_EXCL)
             with os.fdopen(os.open(output_file, flags), "w") as stream:

src/drf_yasg/openapi.py

@@ -12,6 +12,11 @@ from inflection import camelize
 
 from .utils import filter_none, force_real_str
 
+try:
+    from collections import abc as collections_abc
+except ImportError:
+    collections_abc = collections
+
 logger = logging.getLogger(__name__)
 
 TYPE_OBJECT = "object"  #:
@@ -136,7 +141,7 @@ class SwaggerDict(OrderedDict):
             # handle __proxy__ objects from django.utils.functional.lazy
             obj = obj._proxy____cast()
 
-        if isinstance(obj, collections.Mapping):
+        if isinstance(obj, collections_abc.Mapping):
             result = OrderedDict()
             memo[id(obj)] = result
             items = obj.items()
@@ -147,7 +152,7 @@ class SwaggerDict(OrderedDict):
             return result
         elif isinstance(obj, six.string_types):
             return force_real_str(obj)
-        elif isinstance(obj, collections.Iterable) and not isinstance(obj, collections.Iterator):
+        elif isinstance(obj, collections_abc.Iterable) and not isinstance(obj, collections_abc.Iterator):
             return type(obj)(SwaggerDict._as_odict(elem, memo) for elem in obj)
 
         return obj

src/drf_yasg/views.py

@@ -112,7 +112,7 @@ def get_schema_view(info=None, url=None, patterns=None, urlconf=None, public=Fal
         def as_cached_view(cls, cache_timeout=0, cache_kwargs=None, **initkwargs):
             """
             Calls .as_view() and wraps the result in a cache_page decorator.
-            See https://docs.djangoproject.com/en/1.11/topics/cache/
+            See https://docs.djangoproject.com/en/dev/topics/cache/
 
             :param int cache_timeout: same as cache_page; set to 0 for no cache
             :param dict cache_kwargs: dictionary of kwargs to be passed to cache_page
@@ -131,7 +131,7 @@ def get_schema_view(info=None, url=None, patterns=None, urlconf=None, public=Fal
         def without_ui(cls, cache_timeout=0, cache_kwargs=None):
             """
             Instantiate this view with just JSON and YAML renderers, optionally wrapped with cache_page.
-            See https://docs.djangoproject.com/en/1.11/topics/cache/.
+            See https://docs.djangoproject.com/en/dev/topics/cache/.
 
             :param int cache_timeout: same as cache_page; set to 0 for no cache
             :param dict cache_kwargs: dictionary of kwargs to be passed to cache_page
@@ -143,7 +143,7 @@ def get_schema_view(info=None, url=None, patterns=None, urlconf=None, public=Fal
         def with_ui(cls, renderer='swagger', cache_timeout=0, cache_kwargs=None):
             """
             Instantiate this view with a Web UI renderer, optionally wrapped with cache_page.
-            See https://docs.djangoproject.com/en/1.11/topics/cache/.
+            See https://docs.djangoproject.com/en/dev/topics/cache/.
 
             :param str renderer: UI renderer; allowed values are ``swagger``, ``redoc``
             :param int cache_timeout: same as cache_page; set to 0 for no cache